CN1070110C - Method of driving piezo-electric type ink jet head - Google Patents
Method of driving piezo-electric type ink jet head Download PDFInfo
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- CN1070110C CN1070110C CN97115554A CN97115554A CN1070110C CN 1070110 C CN1070110 C CN 1070110C CN 97115554 A CN97115554 A CN 97115554A CN 97115554 A CN97115554 A CN 97115554A CN 1070110 C CN1070110 C CN 1070110C
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- piezoelectric element
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000005499 meniscus Effects 0.000 claims abstract description 109
- 230000008859 change Effects 0.000 claims abstract description 29
- 238000007639 printing Methods 0.000 claims description 69
- 230000000694 effects Effects 0.000 claims description 24
- 238000005507 spraying Methods 0.000 claims description 7
- 239000000976 ink Substances 0.000 abstract description 216
- 239000007788 liquid Substances 0.000 abstract description 35
- 239000002245 particle Substances 0.000 abstract 5
- 238000010586 diagram Methods 0.000 description 35
- 238000003825 pressing Methods 0.000 description 23
- 239000007921 spray Substances 0.000 description 11
- 230000009467 reduction Effects 0.000 description 10
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
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- 230000009471 action Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04541—Specific driving circuit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04563—Control methods or devices therefor, e.g. driver circuits, control circuits detecting head temperature; Ink temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2121—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter
- B41J2/2128—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter by means of energy modulation
Abstract
Disclosed is a method of driving a piezo-electric type ink jet head for jetting inks out of a nozzle by making use of a distortion of a piezo-electric element. The driving method includes a first step of driving the piezo-electric element so that a meniscus of inks is receded from an initial position of the nozzle to a first position within the nozzle, a second step of driving the piezo-electric element so that the meniscus quickly advances from the first position to a second position within the nozzle, and a third step of driving the piezo-electric element so that the meniscus slowly advances from the second position to the initial position. A particle quantity of ink particles is changed by changing a movement quantity from the first position to the second position in the second step. To increase a change width of an ink particle amount and to prevent flying disorder of ink particles by controlling a moving amount of a meniscus at the time of injecting ink at the time of abruptly moving it in a nozzle port direction. A first driving voltage having a gradient in a positive direction is applied to a piezoelectric element, and a meniscus 10 is retracted from an initial position in a pressure chamber direction. Then, a second driving voltage having a negative abrupt gradient is applied to the element and then it is altered to a third driving voltage having a negative smooth gradient. Thus, since an elongating speed of the element transferred to its elongation is quickly decelerated, a small amount of ink liquid at ahead of the meniscus 10 rapidly moved in an outlet direction of a nozzle 1 is sufficiently accelerated, and a following ink liquid is rapidly decelerated. Therefore, an ink liquid near the meniscus 10 starts finely granulating. Ink of a particle amount responsive to a moving amount can be generated by altering a potential difference from the start of the abrupt elongation to the quick deceleration of elongating speed of the element.
Description
The present invention relates generally to and a kind ofly utilizes the distortion of piezoelectric element to drive piezo-electric type ink jet head, thereby with the method for printing ink from the nozzle ejection, more particularly, relates to a kind of method that drives piezo-electric type ink jet head, is used for changing the ink droplet quantity of ejection.
Ink-jet printer is applied to printer, in the equipment such as facsimile machine.In these ink-jet printers, the piezo-electric type ink-jet printer that utilizes piezoelectric element is arranged.Piezoelectricity shape ink-jet printer utilizes the distortion of piezoelectric element that printing ink is penetrated from nozzle.
In such ink-jet printer, require the print point diameter variable, with the dark light degree of reflection printing.For this reason, above-mentioned printer must be able to change the ink droplet quantity of ejection.
Ink ejecting method can be divided into the anodal method that drives blotting after the ink-jet, and negative pole drives the method for ink-jet behind the blotting.According to the negative pole driving method, the ink droplet scattering is even, and the probability that becomes ink droplet is big.
Figure 25 A-25D and Figure 26 A-26E are the schematic diagrames of first kind of prior art.
The d31 type is a kind of model that can cause moderate finite deformation under the positive voltage effect when piezoelectric element shrinks.In this model, piezoelectric element is out of shape on the vertical direction of direction of an electric field.In this d31 type, when the voltage shown in Figure 25 A dotted line acts on the piezoelectric element, just carry out ink jet process behind the blotting.
Figure 26 A-26E is the enlarged drawing of nozzle.Form meniscus 10 at nozzle 1 place.Here, the velocity of meniscus is represented with " V ".
Figure 26 A represents that piezoelectric element is positioned at the nozzle 1 of original state and the state of meniscus 10.The surface tension of meniscus 10 and pressure chamber inner equilibrium, meniscus 10 just is present near the jet hole.
Figure 26 B represents to press the chamber to enlarge because piezoelectric element contracts makes, thereby makes the state of pressing meniscus 10 when negative pressure increases in the chamber.That is to say that it shows that the positive voltage of the band positive slope shown in Figure 25 A dotted line makes the situation of time spent.Press the negative pressure in the chamber bigger, thereby meniscus 10 is just to pressing cavity direction to retreat than the surface tension of meniscus 10.
Figure 26 C be since printing ink influx from ink-feeding device be enough to fall the negative pressure in the low-pressure cavity thereby press that negative pressure in the chamber reduces, meniscus 10 position during stop motion gradually.At this moment, meniscus 10 is pulled to and presses near the chamber.
Figure 26 D is the piezoelectric element position of meniscus 10 when the direction of pressing the chamber to dwindle is expanded suddenly.That is to say that the voltage of the band negative slope shown in its presentation graphs 25A dotted line is made the situation of time spent.Because the malleation in the pressure chamber and the capillary effect of meniscus, meniscus 10 produces laminar flows, and has the bigger speed towards jet hole.Therefore, becoming liquid level 10 just moves to jet hole fast.
Figure 26 E represents the expand state of meniscus 10 when stopping of piezoelectric element.Because printing ink flow in ink-feeding device and the nozzle 1, press the pressure in the chamber to become bigger negative pressure.So the printing ink of nozzle 1 slows down suddenly.But the outer black liquid speed of nozzle is enough to scatter out, thereby overcomes the surface tension that printing ink produces in the nozzle 1, becomes ink droplet.Then, because capillary effect, the printing ink of underspeed is forced to return in the nozzle 1.
Above-mentioned state constantly repeats, and promptly forms ink droplet, penetrates then.
The method of first kind of prior art of control ink droplet quantity is to reduce to be added in voltage magnitude on the piezoelectric element to V
2, shown in Figure 25 A solid line.Therefore just can reduce ink droplet quantity.State when Figure 25 B to 25D represents nozzle 1 and meniscus 10 eject droplets of ink.
State when Figure 25 B represents to begin blotting.Meniscus 10 forwards are pressed the chamber motion.
The state of nozzle 1 and meniscus 10 when Figure 25 C represents that sucking China ink begins to spray.Because the voltage magnitude that is added on the piezoelectric element reduces, the meniscus amount of retreating is little than Figure 26 C.
The state of nozzle 1 and meniscus 10 when Figure 25 D represents that black liquid becomes ink droplet.Because the amount of retreating of meniscus 10 reduces, ink droplet also just reduces.
The method of control ink droplet quantity will be illustrated in conjunction with Figure 27 A to 27D in second kind of prior art.
According to second method, be to reduce ink droplet quantity by changing the meniscus astern speed.Utilize this method, jet velocity is controlled.More particularly, shown in Figure 27 A solid line, the driving voltage of piezoelectric element remains unchanged, and the rate of rise steepening of driving voltage.Steeper slopes, the amount of dripping of ink droplet is just more little.The drive waveforms that produces normal ink droplet quantity is shown in Figure 25 A dotted line.
The state of nozzle 1 and meniscus 10 when Figure 27 B represents to begin blotting.At this moment, blotting makes meniscus 10 when the speed ratio of pressing cavity direction sprays normal ink droplet quantity big (shown in Figure 27 A dotted line) fast.Like this, meniscus 10 moves near just being forced to and pressing the chamber.
Figure 27 C represents to suck the state of nozzle 1 and meniscus 10 when beginning ink-jet behind the China ink.Along with the suction of printing ink, meniscus 10 retreats near pressing the chamber in nozzle 1, so printing ink is just fully quickened.
The state of nozzle 1 and meniscus 10 when Figure 27 D represents that black liquid becomes ink droplet.The black liquid that possesses enough big speed becomes ink droplet, penetrates then.
The method of control ink droplet quantity will be illustrated in conjunction with Figure 28 A to 28D in the third prior art.
According to the third method, shown in Figure 28 A solid line, driving voltage reduces to V
2, with identical in first kind of art methods, the amount of retreating of meniscus reduces during blotting.Meanwhile, voltage change speed is higher during ink-jet, and meniscus velocity reduces when preventing ink-jet.
The state of nozzle and meniscus when Figure 28 B represents to begin blotting.Figure 28 C represents to suck the state of black rear nozzle and meniscus.The pressure amplitude reduces, so meniscus 10 does not fall back near the pressure chamber.So, as mentioned above, printing ink is penetrated fast.At this moment, will penetrate near near the printing ink the jet hole, and not obtain enough speed.But these printing ink mix with the printing ink that the quilt of back fully quickens, and become ink droplet, and ink droplet reaches desired speed on the whole.
When Figure 28 D represents that black liquid becomes ink droplet, the state of nozzle and meniscus.Become ink droplet by the black liquid after fully quickening, and scatter out.
The third method is the reduction that reduces to cause speed owing to the meniscus amount of retreating in order to compensate.
Yet, in the method for first kind of prior art, have following problem.
In nozzle, black liquid is pressed the normal pressure in the chamber to drive and be accelerated.But in case printing ink injection nozzle mouth, black liquid just can not be accelerated De Genggao.Therefore, when adopting this method, if the amount of retreating of meniscus 10 reduces, some printing ink at inner nozzle mouth place penetrate and are not fully quickened from jet hole near jet hole.
Therefore, black liquid does not reach setting speed and just no longer is accelerated.Then, the black liquid that is not accelerated mixes with the black liquid that the quilt of back fully quickens.Laminar condition disappears, and the direction of the velocity of ink droplet is upset.This just causes the scattering stability decreases.Relevant therewith, black liquid losses by mixture kinetic energy, the average speed of ink droplet just reduces.Cause the printed drawings pixel disorderly.
And the method for second kind of prior art there are the following problems.
When meniscus 10 retreats suddenly, press cavity pressure to become malleation, shown in Figure 27 D, so upset in nozzle VELOCITY DISTRIBUTION radially, cause the distribution direction disorder of ink droplet, so, in the drive waveforms shown in Figure 27 A, time T rb can not be compressed too shortly, and like this, the amplitude of variation of ink droplet quantity can not be too big.
And the method for the third prior art there are the following problems.
(1) as in the method for first kind of prior art, because the meniscus amount of retreating reduces, so the scattering direction disorder of ink droplet.
(2) the quantitative change amplitude of dripping of increase ink droplet, the speed of meniscus can increase fast when needing to spray.Even if the speed of meniscus can increase fast when spraying, the speed of meniscus is subjected to the restriction of the intrinsic frequency of piezoelectric element when still spraying.So the amplitude of variation of the ink droplet amount of dripping can not be too big.
(3) if the speed of meniscus increases sharply when spraying, the overshoot of piezoelectric element increases, and produces the ink droplet of following in a large number.Cause print quality to descend, so the amplitude of variation of ink droplet quantity can not be too big.
Main purpose of the present invention provides a kind of method that drives piezo-electric type ink jet head, and by it, the amplitude of variation of ink droplet quantity can strengthen.
Another object of the present invention provides a kind of method that drives piezo-electric type ink jet head, and by it, the ink droplet quantity amplitude of variation can increase, and can prevent that drop speeds from reducing.
A further object of the invention provides a kind of method that drives piezo-electric type ink jet head, and by it, the amplitude of variation of ink droplet quantity can increase, and can prevent the scattering disorder of ink droplet.
The invention provides a kind of method that drives piezo-electric type ink jet head, piezo-electric type ink jet head comprises the pressure chamber of storing printing ink, nozzle and a piezoelectric element of ejection ink droplet from press the chamber are used for to pressing the chamber that the pressure of injection ink droplet and ink droplet quantity that change sprays is provided.Driving method comprises: the first step drives piezoelectric element makes the printing ink meniscus retreat into primary importance in the nozzle from the initial position of nozzle; Second step drove piezoelectric element makes meniscus advance to the second place in the nozzle from primary importance rapidly; The 3rd step drove piezoelectric element makes meniscus slowly be advanced to initial position from the second place.
According to the present invention, the amount of movement of meniscus is fixed during blotting.Then, the amount of movement that meniscus moves to jet hole fast during by the control ink-jet changes ink droplet quantity.
According to the present invention, the amount of movement of meniscus is fixed during blotting, so just be easy to prevent the disorderly and speed reduction of scattering.This is to learn from the prior art that changes meniscus blotting amount.Moreover meniscus is controllable to the amount of movement of jet hole fast during ink-jet, and therefore unlike the prior art, it does not require voltage change rapidly.So the amplitude of variation of ink droplet quantity just can increase.
It will be more apparent that other features and advantages of the present invention are passed through below in conjunction with the description of the drawings.
Accompanying drawing is the part of book as an illustration, has described most preferred embodiment of the present invention, and in conjunction with above summary narration and following detailed description to most preferred embodiment, accompanying drawing plays the effect of explaining inventive principle.
Fig. 1 is the schematic diagram of first embodiment of the invention;
Fig. 2 is the structure chart that is used for ink-spraying-head of the present invention;
Fig. 3 A, 3B, 3C and 3D are the operation schematic diagrames of first embodiment of the invention;
Fig. 4 is the performance plot of first embodiment of the invention;
Fig. 5 A, 5B and 5C are the schematic diagrames of second embodiment of the invention;
Fig. 6 is the property list of second embodiment shown in Fig. 5 A, 5B and the 5C;
Fig. 7 is the schematic diagram of third embodiment of the invention;
Fig. 8 A, 8B, 8C, 8D and 8E are the operation schematic diagrames of third embodiment of the invention;
Fig. 9 is the schematic diagram of four embodiment of the invention;
Figure 10 A, 10B, 10C, 10D and 10E are the operation schematic diagrames of four embodiment of the invention;
Figure 11 is the another kind of structure chart of ink-spraying-head of the present invention;
Figure 12 is the schematic diagram of fifth embodiment of the invention;
Figure 13 is the circuit diagram of drive circuit of the present invention;
Figure 14 is the sequential chart of drive circuit shown in Figure 13;
Figure 15 is the circuit diagram of another drive circuit of the present invention;
Figure 16 is the schematic diagram that concerns of temperature of the present invention and ink viscosity;
Figure 17 is the schematic diagram that concerns of temperature of the present invention and displacement bimorph amount;
Waveform schematic diagram when Figure 18 is temperature-compensating of the present invention;
Figure 19 is the schematic diagram that concerns of temperature of the present invention and ink ejection amount;
Figure 20 is a nozzle structure schematic diagram of the present invention;
Figure 21 is a shower nozzle driving circuit structure schematic diagram of the present invention;
Figure 22 is a print system structural representation of the present invention;
Figure 23 A and 23B are the schematic diagrames that concerns of paper of the present invention and printing effect;
Figure 24 is the structural representation of another print system of the present invention;
Figure 25 A, 25B, 25C and 25D are the schematic diagrames (part 1) of first prior art;
Figure 26 A, 26B, 26C, 26D and 26E are first bright schematic diagrames (part 2) that technology is arranged;
Figure 27 A, 27B, 27C and 27D are the schematic diagrames of second prior art;
Figure 28 A, 28B, 28C and 28D are the schematic diagrames of the 3rd prior art.
Fig. 1 is the schematic diagram of first embodiment of the invention.Fig. 2 is the structural representation of ink-spraying-head.Fig. 3 A to 3D is the operation schematic diagram of first embodiment of the invention.
The structure of ink-spraying-head at first is described referring to Fig. 2.Nozzle 1 ejection printing ink.Nozzle plate 2 forms nozzle 1 and constitutes the wall of pressing chamber 6.Be flexible member 3 between nozzle plate 2 and the pressing plate 4.It has elasticity.The power that pressing plate 4 produces piezoelectric element 5 is delivered to presses on the chamber 6.Piezoelectric element 5 leans against on the pressing plate 4, makes its displacement with voltage.Press the 6 pairs of printing ink pressurizations in chamber.Press chamber 6 to be connected with nozzle 1 and to link to each other with ink box.
Positive voltage is done the time spent, and piezoelectric element 5 shrinks, and presses the d31 type and changes.Then, drive piezoelectric element 5 with opposite polarity.
Secondly, referring to Fig. 1, Fig. 3 A to 3D, introduce first embodiment.
Fig. 1 represents the drive waveforms of piezoelectric element 5.Drive waveforms when the dotted line among Fig. 1 is represented to spray the normal amount ink droplet.Drive waveforms when the solid line among Fig. 1 is represented the less relatively ink droplet of emitted dose.Fig. 3 A to 3D is the operation schematic diagram under waveform effect shown in Fig. 1 solid line.
Fig. 3 A represents that meniscus begins the state of nozzle and meniscus when pressing the chamber to move from initial position.At this moment, as shown in Figure 1, the driving voltage of first kind of band positive slope is added on the piezoelectric element 5.Under this voltage effect, piezoelectric element 5 shrinks, thereby presses generation negative pressure in the chamber 6.Meniscus moves after pressing the chamber from initial position.
Fig. 3 B represents that piezoelectric element 5 just becomes the back meniscus that expands from contraction and begins the state of nozzle and meniscus when jet hole moves fast.More particularly, as shown in Figure 1, the driving voltage of first kind of band positive slope acts on 5 the preceding paragraph time of piezoelectric element t
1After, then apply the driving voltage that second kind of band born steep slope.Through above-mentioned time period t
1After, the driving voltage of band positive slope reaches driving voltage value V
5Identical among maximum and the figure of the driving voltage of band positive slope during the normal ink droplet of injection shown in the dotted line.Thereby meniscus retreats into first desired location in the nozzle 1.The amount of retreating identical when spraying the normal amount ink droplet.
Then, under the driving voltage effect of second kind of band negative slope, piezoelectric element 5 transfers expansion to, thereby meniscus is located to move for 1 mouthful to nozzle fast.
The state of nozzle and meniscus when Fig. 3 C represents that meniscus has just reached the speed of expansion that reduces piezoelectric element 5 after the second place in the nozzle suddenly.More particularly, as shown in Figure 1, be with the driving voltage of negative steep slope to be added in 5 the preceding paragraph time of piezoelectric element t with second kind
2The voltage difference of second kind of driving voltage is V
4Then, elapsed time t
2After, voltage transition is the driving voltage of the negative gentle slope of the third band.So the expansion rate of piezoelectric element 5 reduces suddenly.
In this case, a small amount of printing ink that is present in meniscus edge in the nozzle 1 is fully quickened.Then, the black liquid of back is quick deceleration regime in the nozzle 1.So near the black liquid the meniscus begins to become ink droplet.
The state of nozzle and meniscus when Fig. 3 D represents that piezoelectric element 5 stops to expand.More particularly, it is at the third driving voltage t action time
4After state.In this state, the small volume of ink liquid after fully quickening is broken away from surface tension and is formed ink droplet.And, be negative pressure because printing ink flow into to press in the chamber 6 behind ink supply unit and the nozzle, thereby the printing ink in the nozzle 1 is forced to temporarily move backward along nozzle.Under surface tension effects, printing ink turns back near the jet hole again then.
Like this, when changing ink droplet quantity, the variation of the printing ink amount of retreating is unallowed.So black liquid is fully quickened in nozzle.Thereby, before reducing suddenly from the speed of expansion that begins to expand into suddenly piezoelectric element 5, by changing voltage difference V
4Just can change the amount of movement from the primary importance to the second place.So ink droplet has just formed, its quantity is relevant with amount of movement.
Before descending from the speed of expansion that begins to expand into suddenly piezoelectric element 5, also can come compensation speed by changing time period t 2 suddenly, for example, the slope of voltage when changing rapid expanding.
Fig. 4 is the performance plot of first embodiment of the invention.
Fig. 4 represents to change above-mentioned voltage difference V
4The time ink droplet quantity variation.When injection had the ink droplet of normal ink drop size, a kind of shower nozzle was used in test, at this moment blotting time t
1O80 μ s, ink-jet time t
3Be 8 μ s, voltage magnitude V5 is set to 45V (shown in Fig. 1 dotted line).Shower nozzle injection this moment ink droplet is 55pl.When using this shower nozzle, change voltage difference V
4The time, ink droplet quantity is reduced to 7pl.
Like this, the ink droplet quantity amplitude of variation strengthens, and the fluctuation of speed can be limited in 10% or lower.
Fig. 5 A, 5B and 5C are the schematic diagrames of second embodiment of the invention.Fig. 6 is the property list relevant with Fig. 5 A to 5C.
As shown in Figure 6, the ink droplet quantity of corresponding generation is provided with the 1-4 level.The 1st grade drive waveforms is shown in the dotted line of Fig. 5 A to 5C.In this drive waveforms, voltage magnitude V
5Be 43.5V, blotting time t
1Be 80 μ s, ink-jet time t
2Be 6 μ s, pressure reduction V
4/ V
5Be 1.0.This is set to the ink droplet quantity of normal ink drop size, and its quantity is 56pl.
The 2nd grade drive waveforms is shown in the solid line of Fig. 5 A.In this drive waveforms, voltage magnitude V
5Be 43.5V, blotting time t
1Be 70 μ s, ink-jet time t
2Be 3 μ s, pressure reduction V
4/ V
5Be 0.7, recovery time t
4Be 22 μ s.At this moment ink droplet quantity is 31pl.
The drive waveforms of 3rd level is shown in the solid line of Fig. 5 B.In this drive waveforms, voltage magnitude V
5Be 43.5V, blotting time t
1Be 60 μ s, ink-jet time t
2Be 1 μ s, pressure reduction V
4/ V
5Be 0.5, recovery time t
4Be 24 μ s, this moment, ink droplet quantity was 12pl.
The 4th grade drive waveforms is shown in the solid line of Fig. 5 C.In this drive waveforms, pressure reduction V
5Be 43.5V, blotting time t
1Be 50 μ s, ink-jet time t
2Be 1 μ s, pressure reduction V
4/ V
5Be 0.46, recovery time t
4Be 24 μ s.This moment, ink droplet quantity was 5pl.
Like this, the ink droplet quantity maximum is 56pl in this shower nozzle, and ink droplet quantity can change to minimum of a value 5pl.And the blotting time can change slightly, to change blotting speed.Because this variation, the ink droplet quantity excursion can be widened greatly.In addition, jet speed can be by changing ink-jet time t
2Compensate.Jet speed thereby constant.
Fig. 7 is the schematic diagram of third embodiment of the invention.Fig. 8 A to 8E is the operation schematic diagram of third embodiment of the invention.
Drive waveforms when dotted line is represented to spray the normal amount ink droplet among Fig. 7.Drive waveforms when solid line is represented to spray than a small amount of ink droplet among Fig. 7.Operation schematic diagram when Fig. 8 A to 8B is the small bursts ink droplet.
Fig. 8 A represents that meniscus begins from the state of initial position nozzle and meniscus when pressing the chamber to move.At this moment, as shown in Figure 7, first kind of driving voltage that has positive slope is added on the piezoelectric element 5.Under this voltage effect, piezoelectric element 5 shrinks, thereby produces negative pressure in pressing chamber 6, so meniscus retreats to the pressure cavity direction from initial position.
Fig. 8 B represents that piezoelectric element 5 just transfers the state that the back meniscus that expands begins fast nozzle and meniscus when 1 mouthful at nozzle is mobile to from contraction.More particularly, as shown in Figure 7, the driving voltage of first kind of band positive slope acts on 5 the preceding paragraph time of piezoelectric element t
1, the result is that meniscus retreats into first setting position in the nozzle 1.It is identical when therefore, the amount of retreating is with the normal ink droplet of injection.
At this moment, black liquid still has to the residual speed of pressing the chamber to move.If transfer ink jet process immediately to, for required speed, must there be the energy unhelpful to ink-jet.So, as shown in Figure 7, after pressing the chamber to move to finish, one set time of stop motion section (t
5-t
2), disappear and can not forward next stage to until the speed of black liquid.
Shown in Fig. 8 C, under the driving voltage effect of second kind of band negative slope, piezoelectric element 5 transfers expansion to.So meniscus is located to move for 1 mouthful to nozzle fast.
During the second place, the speed of expansion of piezoelectric element 5 reduces suddenly in meniscus reaches nozzle.Fig. 8 D represents the state of this moment nozzle and meniscus.More particularly, as shown in Figure 7, second kind of driving voltage with negative steep slope is added in 5 the preceding paragraph time of piezoelectric element t
2Here the pressure reduction of Chan Shenging is V
4Then, elapsed time t
2Afterwards, voltage transition is the driving voltage of the negative gentle slope of the third band.So piezoelectric element 5 speeds of expansion reduce suddenly.
In this case, a small amount of printing ink that is present in meniscus edge in the nozzle 1 is fully quickened, and at this moment the printing ink of back is unexpected deceleration regime in the nozzle 1.So near the black liquid the meniscus begins to become ink droplet.
The state of nozzle and meniscus when Fig. 8 E represents that piezoelectric element 5 stops to expand.More particularly, it is the third driving voltage section action time t
4After state.In this state, fully the small volume of ink liquid that quickens is broken away from surface tension, becomes ink droplet.And, be negative pressure because printing ink flows into to make in ink-feeding device and the nozzle 1 to press in the chamber 6, thereby the printing ink in the nozzle 1 is forced to temporarily move backward along nozzle.Then, because surface tension effects, printing ink turns back near the jet hole.
In the 3rd embodiment, when changing ink droplet quantity, the variation of the printing ink amount of retreating is unallowed, thereby black liquid just can fully be quickened in nozzle.Like this, before reducing suddenly from the speed of expansion that begins to expand into suddenly piezoelectric element 5, by changing pressure reduction V
4Change the amount of movement from the primary importance to the second place.Thereby ink droplet has just formed, and its quantity is relevant with amount of movement.
From beginning to expand into suddenly before piezoelectric element 5 speeds of expansion reduce suddenly, change time t
2Also can compensation speed, for example, the slope of voltage when changing rapid expanding.
And before ink-jet, have a process that absorbs black liquid speed, thereby ink jet energy utilization efficiency height.
Fig. 9 is the schematic diagram of four embodiment of the invention.Figure 10 A to 10E is a four embodiment of the invention operation schematic diagram.
Drive waveforms when the dotted line of Fig. 9 is represented to spray the normal amount ink droplet.Drive waveforms when the solid line representative of Fig. 9 is sprayed than a small amount of ink droplet.Figure 10 A to 10E is the operation schematic diagram when spraying less ink droplet quantity.
Figure 10 A represents that meniscus begins the state of nozzle and meniscus when pressing the chamber to move from initial position.At this moment, as shown in Figure 9, the driving voltage of first kind of band positive slope acts on the piezoelectric element 5.Under this voltage effect, piezoelectric element 5 shrinks, thereby produces negative pressure in pressing chamber 6.So meniscus retreats to the pressure chamber from initial position.
Figure 10 B represents that piezoelectric element 5 just transfers the state that the back meniscus that expands begins fast nozzle and meniscus when 1 mouthful at nozzle is mobile to from contraction.More particularly, as shown in Figure 9, the driving voltage of first kind of band positive slope is added in 5 the preceding paragraph time of piezoelectric element t
1The result is that meniscus retreats into first desired location in the nozzle 1.The amount of retreating identical when spraying the normal amount ink droplet.
Do the time spent when the driving voltage of second kind of band negative slope, piezoelectric element 5 transfers expansion to.So meniscus is located to move for 1 mouthful to nozzle fast.
During the second place, the speed of expansion of piezoelectric element 5 reduces suddenly in meniscus arrives nozzle.Figure 10 C represents the state of this moment nozzle and meniscus.More particularly, as shown in Figure 9, be with the driving voltage of negative steep slope to act on 5 the preceding paragraph time of piezoelectric element t for second kind
2, the pressure reduction of generation is V
4
In this case, a small amount of printing ink that is present in the meniscus edge in the nozzle 1 is fully quickened.Then, the black liquid of back is unexpected deceleration regime in the nozzle 1.So near the black liquid the meniscus begins to become ink droplet.
When China ink liquid begins to become ink droplet, the meniscus stop motion.Figure 10 D represents the state of this moment nozzle and meniscus.Therefore, by temporarily making the meniscus stop motion, just be easy to prevent that the black liquid with abundant kinetic energy from mixing with the black liquid that does not possess enough kinetic energy.Because this measure just may prevent that drop speeds from reducing and ink droplet quantity increases.
Elapsed time t then
5Afterwards, voltage transition is the driving voltage of the negative gentle slope of the third band.So the speed of expansion of piezoelectric element 5 weakens.
The state of nozzle and meniscus when Figure 10 E represents that meniscus low speed turns back to initial position.Under this situation, the small volume of ink liquid that is fully quickened is broken away from surface tension and is become ink droplet.And, produce negative pressure in the chamber 6 owing to printing ink flow into to make in ink-feeding device and the nozzle 1 to press, thereby the printing ink in the nozzle 1 is forced to temporarily move in nozzle.Then, because surface tension effects, printing ink turns back near the jet hole.
In the 4th embodiment, when changing ink droplet quantity, do not allow to change the printing ink amount of retreating, thereby black liquid is fully quickened in nozzle equally.Like this, before reducing suddenly from the speed of expansion that begins to expand into suddenly piezoelectric element 5, by changing voltage difference V
4Just can change the amount of movement from the primary importance to the second place.So ink droplet has just produced, its quantity is relevant with amount of movement.
Suddenly before reducing from the speed of expansion that begins to expand into suddenly piezoelectric element 5, by changing time t
2Also can compensation speed, voltage slope when for example changing rapid expanding.
And, in ink jet process, make the temporary transient stop motion of meniscus, thereby just be easy to prevent that the black liquid that possesses abundant kinetic energy from mixing with the black liquid that does not possess abundant kinetic energy.Because this measure just may prevent that the speed of ink droplet from reducing, and can prevent that also ink droplet quantity from increasing.Therefore, just can produce ink droplet than a small amount of, can be at inner control ink droplet quantity in a big way.
Figure 11 is the another kind of structure chart of ink-spraying-head.Figure 12 is the schematic diagram of four embodiment of the invention.
As shown in figure 11, nozzle plate 2 constitutes nozzle 1.Wall spare 11 constitutes the wall of pressing chamber 6.Piezoelectric element 7 constitutes the wall of pressing chamber 6.Piezoelectric element 7 has electrode 8a, 8b respectively on the two sides.
Drive waveforms when Figure 12 represents that first embodiment shown in Figure 1 acts on d33 type shower nozzle.Also just say, at initial position making alive V
5Under this effect, shown in the dotted line of Figure 11, piezoelectric element 7 expands, and presses chamber 6 to dwindle.
During ink-jet, driving voltage reduces to 0V.Thereby piezoelectric element 7 contractions are enough to produce negative pressure in pressing chamber 6.So printing ink is drawn in the nozzle 1.When driving voltage became 0V, piezoelectric element 7 expanded.Then, improve driving voltage to positive voltage V with steep slope
4
Reach V
4After, improve driving voltage to V with gentle slope again
5
In this embodiment, identical with first embodiment, realized the operation of Fig. 3 A to 3D.This embodiment also has identical operational effect with first embodiment.And third and fourth embodiment is also applicable.
Figure 13 is the schematic diagram of a drive circuit embodiment of the present invention.Figure 14 is a sequential chart.According to this embodiment, reflect a little depth degree by changing the voltage that applies on each nozzle.
Referring to Figure 13, the ROM20 storage is used to produce the data of depth degree drive waveforms.Digital-to-analogue (D/A) the converter 30-32 driving data that ROM is given converts analog quantity to.Integrating circuit 33-35 is with the output quantity integration of D/A converter 30-32.Amplifying circuit 36-38 amplifies the output quantity of integrating circuit 33-35.
Printed waveform generating unit 21-23 produces the drive waveforms that differs from one another, and it is made up of D/A converter 30-32, integrating circuit 33-35 and amplifying circuit 36-38.
On each nozzle, all have piezoelectric element 51-5n, in order to drive dynamic pressure cavity.On each piezoelectric element 51-5n on-off circuit 61-6n is housed, according to the selection signal of drive waveforms selected cell 24, the drive waveforms that selective printing waveform generating unit 21-23 produces is added in it on piezoelectric element 51-5n.
Drive waveforms selected cell 24 is by decoder 40, and shift register 41 and register 42 are formed.Decoder 40 is with two depth degree data-signals, and each some depth degree numerical value that the print control unit that its representative does not show from figure transmits is converted into three parallel decoded signals.Shift register 41 is made up of the 3n bit shift register, and the sampled clock signal that produces according to each point receives decoded signal.Register 42 is made up of the 3n bit shift register, the content that the latch clock signal of the every n of data some generation comes latch shift register 41.
The explained later operation.Under the control of the print control unit that does not show, ROM20 outputs to three kinds of m position drive waveforms generation data on three printed waveform generating unit 21-23.D/A converter 30-32 in the printed waveform generating unit 21-23 produces and data-signal correspondent voltage value.Then, integrating circuit 33-35 exports drive waveforms with the voltage integrating meter that produces.Drive waveforms depends on time and magnitude of voltage among the D/A converter 30-32, and the integration constant of integrating circuit 33-35.The output valve of integrating circuit 33-35 is exaggerated circuit 36-38 amplifies, and outputs on the on-off circuit 61-6n.
On the other hand, represent spray each point depth degree numerical value binary data signal be imported on the decoder 40, convert thereof into three decoded signals.Everybody of these signals is corresponding with the switch of on-off circuit 61-6n.Therefore,, make that 1 is fixed as " lead to " in 3, or all is " breaking " according to 3 decoded signals of depth degree data-signal output.
These three decoded signals enter in the shift register 41 successively according to sampled clock signal.When the signal of all piezoelectric element 51-5n enters in the shift register 41, the content of shift register 41 is deposited in the register 42 according to the latch clock signal.Thereby shift register 41 is in the state of waiting for the next print signal of input.
The signal of storage outputs on the on-off circuit 61-6n that links to each other with piezoelectric element 51-5n in the register 42.In on-off circuit 61-6n, according to these signals, one in three switches is " leading to ", or all switches all are " breaking " shape.
Therefore, piezoelectric element 51-5n can be in following state: need not apply waveform when not printing, or apply the highly dense point of injection that is produced by printed waveform generating unit 21-23, the drive waveforms of normal density point or low-density point.
Make further explanation referring to Figure 14.The depth degree data-signal is defined as two-position signal, has value " 0 "-" 3 ".Then, each of these signals is sent on the piezoelectric element 51-5n.The ink density that piezoelectric element 51-5n sprayed when these signals were represented next ink-jet.For example, if the depth degree data-signal is a two-position signal, this represents four types as " not printing ", " high density ", " normal density " and " low-density ".
ROM20 will output on the printed waveform generating unit 21-23 corresponding to the driving data of " high density ", " normal density " and " low-density ".The signal of the change waveform voltage of output this moment is exported from D/A converter 30-32 output.Conversion speed depends on the magnitude of voltage of D/A converter 30-32 output.And the time of improving output voltage is also depended on the signal output time width of D/A converter 30-32.
Figure 14 represents the drive waveforms that the drive waveforms with second and the 3rd above-mentioned embodiment combines.Time t
6When being made as " 0 ", it represents the drive waveforms of the 3rd embodiment.Time t
7When being made as " 0 ", the drive waveforms of second embodiment of its expression.If time t
6And t
7Be zero, it represents the drive waveforms of first embodiment.
Thereby printed waveform generating unit 21-23 produces the drive waveforms of three kinds of depth degrees.Therefore, according to selecting the on-off circuit 61-6n link to each other with piezoelectric element 51-5n with the depth degree data-signal.The drive waveforms of representing the depth degree data-signal is added on the piezoelectric element 51-5n.So because the driving of piezoelectric element 51-5n will spray ink droplet, its amount adapts with depth degree.
Figure 15 is the circuit diagram of another drive circuit of the embodiment of the invention.As shown in figure 15, identical with Figure 13 parts are marked with same numeral.In the present embodiment, unique printed waveform generating unit 21 produces drive waveforms has certain depth degree with ejection ink droplet.Printed waveform generating unit 21 is converted to the depth degree numerical value relevant with the time with drive waveforms, and with its output, has so just formed the depth degree of point.
On-off circuit 6-l to 6-n is corresponding with piezoelectric element 51-5n, and whether decision is added in driving voltage on the piezoelectric element 51-5n.Under the control of the print control unit that does not demonstrate, ROM20 outputs to three kinds of m position drive waveforms generation data on unique printed waveform generating unit 21 successively.In this printed waveform generating unit 21, D/A converter 30 produces and the corresponding voltage of data-signal.Then, integrating circuit 33 is exported drive waveforms with the voltage integrating meter that produces.Drive waveforms depends on the time and the magnitude of voltage of D/A converter, and the integration constant of integrating circuit 33.Integrating circuit output quantity 33 is exaggerated circuit 36 amplifies, and it is outputed on each piezoelectric element 51-5n.
On the other hand, represent 1 printing of each nozzle ink jet on/off state to select signal to be sent to successively on the shift register 41 according to sampled clock signal.When the signal of all piezoelectric element 51-5n was sent to shift register 41, the content of shift register 41 was deposited in the register 42 according to the latch clock signal.So shift register 41 is in the state of waiting for the next print signal of output.
The signal that register 42 is deposited outputs on the switch 6-1 to 6-n that links to each other with piezoelectric element 51-5n.These signal controlling 6-1 to 6n on-off.
Therefore, following state can appear in piezoelectric element: need not apply drive waveforms when not printing, or apply the drive waveforms that printed waveform generator 21 produces.Drive waveforms is followed successively by the waveform that sprays high density point, normal density point and low-density point.
ROM20 will output in the printed waveform generating unit 21 with " high density ", " normal density " and " low-density " corresponding driving data successively, thereby drive waveforms changes with depth degree.In the drive waveforms of every kind of depth degree, print and select signal to be changed to the on/off state, will act on the specific piezoelectric element 51-5n corresponding to the driving signal of characteristics depth degree.So under piezoelectric element 51-5n drives, with the drops out from nozzles ejaculation of the specific depth degree of representative.
Then, with the relation of introducing between environment temperature and ink jet amount.
Figure 16 is the graph of a relation between temperature and the ink viscosity.Figure 17 is the graph of a relation between temperature and the piezo-electric element displacement amount.Drive waveforms figure when Figure 18 is temperature-compensating.Figure 19 is the graph of a relation between temperature and the ink jet amount.Figure 20 is the structure chart of shower nozzle of the present invention.Figure 21 is the structure chart of shower nozzle drive circuit of the present invention.
Temperature as shown in figure 16 and the relation between the ink viscosity.Along with temperature raises, ink viscosity reduces.And as shown in figure 17, according to concerning between temperature and the displacement bimorph amount, along with temperature raises, piezoelectric elements displacement quantitative change is big.
Therefore, shown in Figure 19 dotted line, when higher temperature, the ink jet quantitative change is big.That is to say that the displacement of piezoelectric element is little during low temperature, ink viscosity increases, and causes the ink jet amount to reduce.So print density reduces.Otherwise the displacement of piezoelectric element raises during high temperature, and ink viscosity reduces, and causes the ink jet amount to increase.Therefore print density increases.
Preventing that the printing ink discharge rate from varying with temperature to relate to temperature change drives signal.This just needs to prepare the every driving data relevant with temperature.The preparation of the every driving data relevant with temperature is time-consuming, and ROM20 also needs certain memory space.
For avoiding this point,, do not change the driving amplitude, as shown in figure 18 with driving data according to present embodiment.More particularly, as shown in figure 18, improve to drive the amplitude of signal during low temperature, and reduce the amplitude that drives signal during high temperature.
Because this adjustment, shown in Figure 19 solid line, the ink jet amount is constant, and irrelevant with the temperature of shower nozzle.
Figure 20 and Figure 21 represent to realize this method that need not to change driving data.As shown in figure 20, ink-spraying-head 13 has four nozzle units 12, is set up in parallel.On the printing panel 14 of this shower nozzle 13 temperature measuring equipment 15 is housed.The temperature measuring equipment 15 that is made of thermistor is installed near the shower nozzle 13, is used for measuring the temperature of shower nozzle 13.
As shown in figure 21, the shower nozzle drive circuit is made up of reference voltage generating circuit 46, amplitude voltage generation circuit 46, drive waveforms generation circuit 39 and amplifying circuit 36.Reference voltage generating circuit 46 provides reference voltage Vr for voltage magnitude generation circuit 45.
Amplitude voltage generation circuit 45 is made up of multiplication type digital-to-analogue (D/A) converter.Represent the amplitude data Dg of amplitude voltage to be input in the amplitude voltage generation circuit 45, it just produces an amplitude voltage Vg, and its size is corresponding with amplitude data Dg.
Trample given amplitude data Dg by the printing control electricity that does not demonstrate.The printing control circuit decides amplitude data Dg by the measured value of temperature measuring equipment 15, and it is outputed on the amplitude voltage generation circuit 45, as shown in figure 18, prints control circuit and adjusts amplitude data Dg according to the temperature of temperature measuring equipment 15 mensuration.For example, improve amplitude during low temperature, reduce amplitude during high temperature.
Drive waveforms generating means 39 is made up of multiplication type D/A (D/A) converter and integrating circuit, as shown in figure 13.Like this, multiplication type d/a converter is finished the D/A conversion of driving data (Wave data) Dw, and the amplitude voltage of amplitude voltage generation this moment circuit 45 plays the effect of reference voltage.As shown in figure 13, driving data Dw is exported from ROM20.
The output quantity of this multiplication type d/a converter is produced and is driven signal Vw by the integrating circuit integration.Then, amplifying circuit 36 will drive signal Vw and amplify, and output signal Vout is outputed on the piezoelectric element.
Like this, do not change driving data (Wave data), and only change the amplitude that drives signal.So, do not need the various driving data relevant with temperature.Therefore, neither need to prepare the various driving data relevant, also do not need to increase the capacity of ROM20 with temperature.
If when printing one page, the printing ink discharge rate that Yin Wendu is produced is revised, so just cause that print density may change in one page.Therefore, just need to revise between page or leaf.
Do an explanation with regard to how controlling printing ink discharge rate adaptation paper type below.
It all is suitable that affinity between print media and printing ink is tackled the two.So the printing ink injection rate changes because of the kind of printing ink and print media.Therefore, the printing ink and the print media that are used for this equipment will limit to some extent, avoid the printing ink injection rate to change.
But still need to use various print media.Therefore, outside the print media that limits, print quality reduces inevitable.When particularly on recycled writing paper, printing, be prone to stain along the fiber of paper.And when on coated paper, printing, whether occur stain easily and depend on compatibility with printing ink.
In this case, obtain desirable printing effect by changing with the corresponding ink jet amount of employed paper.
Figure 22 is the calcspar of print system structure of the present invention.Figure 23 A and 23B are respectively the graphs of a relation of paper and printing effect.
So these type faces just are stored in the video memory 71.
Operation panel 72 by the switch of choice record-paper type, be used for showing the display unit (as liquid crystal board) of record-paper type face of selection and the switch of selecting the ink jet amount, be used for selecting suitable picture quality from display.
Print data processing unit 70 is handled the print data that is sent by main frame 80.For example, print data is handled 70 print data is converted to view data, and ink jet amount computing unit 73 calculates and the corresponding ink jet amount of the ink jet amount control data of being set by operation panel 72.Shower nozzle control module 74 produces above-mentioned drive waveforms according to the emitted dose control data, and controls printer prints unit 75 according to print data.Printer prints unit 75 is above-mentioned ink-spraying-head.
Introduce operation below.According to the input instruction from main frame 80, print data processing unit 70 produces all or part of image that will print.Ink jet amount computing unit calculates the corresponding ink jet amount of image therewith.Shower nozzle control module 74 produces and ink jet amount corresponding driving waveform, prints by control printer prints unit 75.
In this case, the operator is from the type of the used paper of operation panel 72 inputs.The type face of the paper type of being imported is read from video memory 71.Type face is presented on the display unit of operation panel 72.For example, if paper setting is a recycled writing paper, for the recycled writing paper quantity of ink be " little ", " in " and when " greatly ", demonstrate three kinds of type faces, shown in Figure 23 A.Moreover, if when paper is coated paper, for the coated paper quantity of ink be " little ", " in " and demonstrate three kinds of type faces when " greatly ", shown in Figure 23 B.
After seeing displaying contents, operator selectable is selected best picture quality.Switch by damage plate 72 then, input " greatly " " in " a kind of in " little " gauging China ink.Ink jet amount computing unit 73 calculates the ink jet amount according to the quantity of ink of selecting, control shower nozzle control module 74.
Referring to Figure 23 A and 23B, to ink jet recording paper be set to " in " the gauging China ink.From Figure 23 A and 23B as can be seen, be set to " in " hair and stain be clearly during the gauging China ink.Just can recognize that quantity of ink is adjusted to " little " just can improve picture quality.
Therefore, the printing effect that will obtain optimum picture quality corresponding to the record-paper type is easy.All kinds of the increasing of record-paper that is used for ink-jet printer.And, before printing,, therefore do not need to print experiment with regard to the displayable image quality.Thereby just avoid record-paper and printing ink to waste.
Thereby then introduce another and can change the print system that the ink jet amount obtains the optimal printing effect according to used paper.
Figure 24 is the structure chart of another print system of the present invention.
Operation panel 82 comprises the switch of selecting the record-paper type, be used for showing selected record-paper type face display unit (as display) and select the switch of quantity of ink to be used for choosing suitable picture quality from display.
Printer driver (software) 83 has print image and produces function and print density instruction generation function.Print image produces the print image that function produces printer.The print density instruction produces function according to the ink jet amount that transmits from operation panel 82, produces the instruction of printer prints density.
Print data processing unit 70 is handled the print data (comprising the ink jet amount) that transmits from the printer driver 83 of main frame 80.Shower nozzle control module 74 produces above-mentioned drive waveforms according to ink jet amount control data, and controls the print unit 75 of printer according to print data.Printer prints unit 75 is above-mentioned ink-spraying-head.
Introduce operating process below.According to from the given print data of main frame 80, print data processing unit 70 produces all or part of image that will print.Shower nozzle control module 74 produces and ink jet amount corresponding driving waveform, and prints by control printer prints unit 75.
Before operation, the operator is from the employed paper type of the operation utmost point 82 inputs.From video memory 81, read the type face of corresponding input paper type.This type face is presented on the display unit (display) of operation panel 82.For example, if paper is a recycled writing paper, for recycled writing paper when quantity of ink be " little ", " in " and show three kinds of type faces when " greatly ", as Figure 23 A.In addition, if when paper is coated paper, for coated paper when quantity of ink be " little ", " in " and show three kinds of type faces when " greatly ", shown in Figure 23 B.
After seeing displaying contents, decrease the optional picture quality of selecting the best of the wounded.Then, the output of the switch by operation panel 82 " greatly ", " in " and " little " gauging China ink in a kind of.The print density instruction of printer driver 83 produces function and produces and the corresponding to print density instruction of selected quantity of ink (printing ink discharge rate).Then, print density instruction and print data are outputed on the printer 7 together.
Like this, just can obtain the print result that the respective record sheet type has optimum picture quality.Thereby the record-paper kind that is used for this ink-jet printer can increase.And, because shown picture quality before printing, just do not need to print experiment or similarly work.In addition, main frame has stored the printed words image with a large amount of memory spaces, so printer itself does not just need big capacity internal memory.
Except embodiment discussed above, the present invention also can be following state:
(1) with three embodiment driving method has been described.But for example, second embodiment and the 3rd embodiment combine also and can realize.
(2) with Fig. 2 and shower nozzle shown in Figure 11 ink-spraying-head is described, but also can be other form.
Up to the present, the present invention is discussed by each embodiment.Various variations in main idea scope of the present invention all can realize.These variations also are not precluded within outside the scope of the invention.
Total the above, the present invention has following effect.
(1) amount of movement of meniscus is fixed during blotting, therefore just is easy to prevent falling of ink droplet scattering disorder and speed Low.
(2) during ink-jet, amount of movement can be controlled when meniscus moved to jet hole fast, thereby ink droplet quantity Amplitude of variation has just increased.
Claims (9)
1, a kind of method that drives the piezo-electric type ink gun, the piezo-electric type ink gun comprises the pressure chamber that receives printing ink, and ink droplet is pressed the nozzle of chamber ejection from this, and is used for spraying ink droplet and change institute ink droplets amount for this pressure chamber provides the piezoelectric element of pressure, this method comprises:
The first step drives above-mentioned piezoelectric element makes the printing ink meniscus fall back on primary importance in the nozzle from the initial position of said nozzle;
Second step drove above-mentioned piezoelectric element makes meniscus advance to the second place in the nozzle from primary importance fast;
The 3rd step drove above-mentioned piezoelectric element makes meniscus slowly be advanced to initial position from the second place.
2, the method for driving piezo-electric type ink gun according to claim 1, described second step is to change the amount of movement of meniscus from the primary importance to the second place according to the ink drop size of being sprayed.
3, in the method for driving piezo-electric type ink gun according to claim 1, also comprise:
There was the 4th step in the above-mentioned first step with between second step, drives piezoelectric element and make meniscus slowly stop one period scheduled time at the primary importance place.
4, in the method for driving piezo-electric type ink gun according to claim 1, also comprise:
Between above-mentioned second step and the 3rd step, there was the 5th step, drives piezoelectric element and make meniscus slowly stop one period scheduled time at second place place.
5, in the method for driving piezo-electric type ink jet head according to claim 3, also comprise:
Between above-mentioned second step and the 3rd step, there was the 5th step, drives piezoelectric element, make meniscus slowly stop one period scheduled time at second place place.
6, in the method for driving piezo-electric type ink jet head according to claim 2, above-mentioned second step is to change the translational speed of meniscus from the primary importance to the second place according to institute's ink droplets amount.
7, in the method for driving piezo-electric type ink jet head according to claim 2, above-mentioned second step is that the minimizing according to institute's ink droplets amount reduces the amount of movement of meniscus from the primary importance to the second place.
8, in the method for driving piezo-electric type ink jet head according to claim 6, described second step is that the minimizing according to institute's ink droplets amount improves the translational speed of meniscus from the primary importance to the second place.
9, in the method for driving piezo-electric type ink jet head according to claim 1, the described first step is first driving voltage that acts on described piezoelectric element with first slope characteristics;
Described second step is second driving voltage that acts on the second steep slope characteristic opposite with first slope characteristics on described piezoelectric element;
Described the 3rd step is the 3rd driving voltage of effect the 3rd mild slope characteristics than second slope characteristics on described piezoelectric element.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP148800/96 | 1996-06-11 | ||
| JP14880096A JP3349891B2 (en) | 1996-06-11 | 1996-06-11 | Driving method of piezoelectric ink jet head |
| JP148800/1996 | 1996-06-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1172732A CN1172732A (en) | 1998-02-11 |
| CN1070110C true CN1070110C (en) | 2001-08-29 |
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ID=15460997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97115554A Expired - Fee Related CN1070110C (en) | 1996-06-11 | 1997-06-11 | Method of driving piezo-electric type ink jet head |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6217141B1 (en) |
| EP (1) | EP0812689B1 (en) |
| JP (1) | JP3349891B2 (en) |
| CN (1) | CN1070110C (en) |
| DE (1) | DE69700489T2 (en) |
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| GB2338928B (en) | 1998-07-02 | 2000-08-09 | Tokyo Electric Co Ltd | A driving method of an ink-jet head |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5221931A (en) * | 1988-04-26 | 1993-06-22 | Canon Kabushiki Kaisha | Driving method for ink jet recording head and ink jet recording apparatus performing the method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4714935A (en) | 1983-05-18 | 1987-12-22 | Canon Kabushiki Kaisha | Ink-jet head driving circuit |
| US4617580A (en) * | 1983-08-26 | 1986-10-14 | Canon Kabushiki Kaisha | Apparatus for recording on different types of mediums |
| US4897665A (en) * | 1986-10-09 | 1990-01-30 | Canon Kabushiki Kaisha | Method of driving an ink jet recording head |
| JPH026137A (en) | 1988-06-27 | 1990-01-10 | Canon Inc | Method of driving ink jet recording head |
| DE69016396T2 (en) | 1990-01-08 | 1995-05-18 | Tektronix Inc | Method and apparatus for printing with resizable ink drops using a responsive ink jet printhead. |
| JP3468377B2 (en) | 1993-03-01 | 2003-11-17 | セイコーエプソン株式会社 | Driving method of ink jet recording head, ink jet recording apparatus, and control apparatus of ink jet recording head |
| JP3503656B2 (en) * | 1993-10-05 | 2004-03-08 | セイコーエプソン株式会社 | Drive unit for inkjet head |
| JPH0858116A (en) | 1994-08-25 | 1996-03-05 | Fujitsu Ltd | Ink jet recording apparatus |
-
1996
- 1996-06-11 JP JP14880096A patent/JP3349891B2/en not_active Expired - Lifetime
-
1997
- 1997-06-09 US US08/868,832 patent/US6217141B1/en not_active Expired - Lifetime
- 1997-06-10 EP EP97304028A patent/EP0812689B1/en not_active Expired - Lifetime
- 1997-06-10 DE DE69700489T patent/DE69700489T2/en not_active Expired - Lifetime
- 1997-06-11 CN CN97115554A patent/CN1070110C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5221931A (en) * | 1988-04-26 | 1993-06-22 | Canon Kabushiki Kaisha | Driving method for ink jet recording head and ink jet recording apparatus performing the method |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0812689B1 (en) | 1999-09-08 |
| CN1172732A (en) | 1998-02-11 |
| DE69700489D1 (en) | 1999-10-14 |
| DE69700489T2 (en) | 1999-12-30 |
| US6217141B1 (en) | 2001-04-17 |
| EP0812689A1 (en) | 1997-12-17 |
| JP3349891B2 (en) | 2002-11-25 |
| JPH09327908A (en) | 1997-12-22 |
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